My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ22
- Part No.:
- SMCJ22
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ22.pdf
- Description:
- 1500W, 27.1V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ22 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 22V working stand-off voltage (VWM), 24.4–29.8V breakdown voltage (VBR), and 39.4V maximum clamping voltage (VC) at 39A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ22 datasheet, SMCJ22 pinout, SMCJ22 application, or SMCJ22 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement on high-reliability PCBs.
Technical Context
The SMCJ22 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (24.4–29.8V @ 1mA). It clamps transients to ≤39.4V at 39A (10/1000μs waveform), limiting energy dissipation via thermal conduction through its DO-214AB case (RθJC = 10°C/W).
Its fast response (<1.0ps from 0V to VBR min), low leakage (<1μA @ 22V), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b make it suitable for protecting 24V automotive ECUs, industrial PLC I/O modules, and DC power distribution networks against EFT and load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 24.4 V / 29.8 V @ 1 mA - Avalanche breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 39.4 V @ 39 A - Clamped voltage during 10/1000μs surge, directly limiting downstream IC stress |
| PPK | 1500 W - Peak pulse power handling capability per single non-repetitive event |
| TJ max | +150 °C - Maximum junction temperature, enabling operation in under-hood automotive environments |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance, guiding heatsinking requirements on standard FR-4 |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off, minimizing quiescent power loss in battery-backed systems |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band, MSL Level 1, UL 94V-0 rated, weight ≈0.210g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Ground reference | Connected to system ground or low-side return; defines unidirectional conduction direction |
| Cathode | Transient clamping node / High-side connection | Connected to protected line (e.g., 24V rail); conducts avalanche current to ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT), meeting automotive EMC requirements |
| Fast response time | <1.0 ps rise-to-VBR enables clamping before sensitive downstream logic or analog circuitry is damaged |
| Automated placement compatibility | DO-214AB footprint and lead geometry support high-yield pick-and-place assembly without tombstoning |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive, supporting green manufacturing and end-of-life recycling |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIO and CAN transceiver power rails from alternator load dump and relay coil flyback in 24V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 24V supply and local regulator input, conducting only during negative transients relative to ground. Use Value: Limits voltage excursion to ≤39.4V during 1500W pulses, preventing latch-up or permanent damage to 3.3V/5V LDOs and MCU I/O cells. | Use Scenario: Shielding 24V digital input channels of programmable logic controllers from field-wiring induced surges and EFT bursts in factory automation. IC Role / Device Role / Timing Role: Front-end transient suppressor on each isolated input channel, positioned before optocoupler or signal conditioner. Use Value: Maintains <1μA leakage at 22V, preserving input threshold accuracy while surviving repetitive 1kV/5kHz EFT per IEC 61000-4-4. |
| DC Power Distribution Unit (PDU) | LED Driver Power Stage Protection |
Use Scenario: Safeguarding MOSFET gate drivers and current-sense amplifiers in 24V/48V server rack PDUs exposed to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Parallel-connected TVS across main DC bus, absorbing energy from inductive kickback during breaker tripping or connector mating. Use Value: Delivers 1500W peak power rating with 10°C/W junction-to-case resistance, enabling effective heat transfer to copper pour without external heatsink. | Use Scenario: Protecting buck controller ICs and high-side switches in constant-current LED drivers used in outdoor signage and street lighting. IC Role / Device Role / Timing Role: Clamp diode on primary-side 24V input rail, shunting inductive spikes generated by transformer leakage or output short-circuit recovery. Use Value: Achieves 39.4V clamping at 39A with <1.0ps response, ensuring LED driver ICs remain within absolute maximum ratings during worst-case surge conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Lower PPK (400W), smaller SMA package (DO-214AC), higher VC (41.2V @ 12.3A) | Not suitable for ISO 7637-2 Pulse 1 (load dump); limited to lower-energy ESD/EFT scenarios | Select SMCJ22 for 1500W automotive-grade surge immunity; SMAJ22A only where space constraints override power handling needs. |
| SMCJ22A | Tighter VBR tolerance (24.4–26.9V vs. 24.4–29.8V), same package and clamping (35.5V @ 44A), lower leakage | Identical mechanical fit and board layout; preferred where tighter voltage control improves system margin | SMCJ22A offers improved VBR consistency and lower clamping voltage - use when design requires tighter regulation of turn-on threshold. |
Compared with SMAJ22A, the SMCJ22 delivers 275% higher peak power handling and lower clamping voltage, making it appropriate for harsh automotive environments; versus SMCJ22A, it trades VBR tolerance for broader process margin and cost efficiency in high-volume production.
Availability
SMCJ22 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and DC power distribution units requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMCJ22 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management components.
The SMCJ series belongs to TSC's high-power surface-mount TVS portfolio, engineered specifically for ISO 7637-2-compliant automotive and industrial transient suppression where robustness, repeatability, and MSL-1 manufacturability are critical.
FAQ
What is the maximum clamping voltage of the SMCJ22 under standard test conditions?
The SMCJ22 has a maximum clamping voltage (VC) of 39.4 V when subjected to a 10/1000 μs surge waveform at 39 A peak pulse current (IPPM), as specified in the Taiwan Semiconductor datasheet. This value ensures downstream 24V-rated ICs remain within safe operating limits during transient events. The SMCJ22 achieves this clamping performance while maintaining low leakage and fast response, making it suitable for demanding automotive applications.
Is the SMCJ22 unidirectional or bidirectional, and how is polarity identified?
The SMCJ22 is a unidirectional TVS diode, meaning it clamps only in reverse bias and conducts forward current like a standard diode. Polarity is marked by a cathode band on the DO-214AB (SMC) package body - the banded end connects to the protected line (e.g., 24V rail), while the unbanded end connects to ground. This configuration prevents forward conduction during normal operation and enables precise clamping during overvoltage events. The SMCJ22 does not support bidirectional operation unless paired with a complementary device.
Does the SMCJ22 meet automotive EMC standards such as ISO 7637-2?
Yes, the SMCJ22 meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (supply line transients), and Pulse 3a/3b (electrical fast transients), as confirmed in Taiwan Semiconductor's official documentation. Its 1500W peak power rating, low clamping voltage, and fast response (<1.0 ps) enable reliable suppression of automotive-level transients without requiring additional filtering stages. Engineers deploying the SMCJ22 in BCM or ECU designs can rely on its validated compliance for system-level EMC certification.
What is the moisture sensitivity level (MSL) and reflow profile guidance for the SMCJ22?
The SMCJ22 is rated MSL Level 1 per J-STD-020, meaning it is not moisture-sensitive and may be stored indefinitely at ambient conditions without dry-pack requirements or floor-life limitations. It supports standard lead-free reflow profiles up to 260°C peak temperature, with matte tin-plated leads compliant to J-STD-002 for solderability. This eliminates bake-out steps and simplifies SMT line integration - a key advantage for high-throughput automotive electronics manufacturing where the SMCJ22 is commonly deployed.
How does the SMCJ22 compare to the SMCJ22A variant in terms of electrical performance?
The SMCJ22A offers a tighter breakdown voltage range (24.4–26.9 V vs. 24.4–29.8 V for SMCJ22) and lower clamping voltage (35.5 V @ 44 A vs. 39.4 V @ 39 A), resulting in improved overvoltage margin for precision-sensitive circuits. Both share identical DO-214AB packaging, thermal specs, and ISO 7637-2 compliance. The SMCJ22 provides broader process tolerance and cost efficiency, while the SMCJ22A suits designs requiring stricter VBR control - users should select based on system-level voltage margin analysis and production yield targets for the SMCJ22.
SMCJ22 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 39A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ22 FAQ
1.How can I place an order for SMCJ22 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ22 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMCJ22 reliable?
The price and inventory of SMCJ22 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ22 is usually 5 days.
3.What payment methods are accepted for SMCJ22?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ22 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ22?
SMCJ22 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ22 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMCJ22?
For technical support, including SMCJ22 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ22 requirements.
6.How does Aetrix verify that SMCJ22 is sourced from the original manufacturer or authorized distributors?
All SMCJ22 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMCJ22 meets industry standards.
7.What is the process for return or replacement of SMCJ22?
All SMCJ22 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ22, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMCJ22 part is unused and in its original packaging.
Return procedure for SMCJ22:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ22 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
